﻿<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS+JS制作的进度条（二）</title>
    <style type="text/css">
        #divLoadCont{position:absolute; z-index:500; left:0; top:0; width:100%; height:98%; clip:rect(0,100%,100%,0); background-color:white; layer-background-color:white; }
        #divLoad1{position:absolute; layer-background-color:silver; background-color:silver}
        #divLoad2{position:absolute; left:0; top:0; layer-background-color:navy; background-color:navy}
        #divLoadText{position:absolute; background-color:transparent; font-family:arial,helvetica; color:Navy; font-size:14px; }
    </style>
    <script language="JavaScript" type="text/javascript">
        function pro_bwcheck(){                     //检测浏览器的代码-通用
            this.ver=navigator.appVersion
            this.agent=navigator.userAgent
            this.dom=document.getElementById?1:0
            this.opera5=this.agent.indexOf("Opera 5")>-1
            this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0;
            this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
            this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
            this.ie=this.ie4||this.ie5||this.ie6
            this.mac=this.agent.indexOf("Mac")>-1
            this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0;
            this.ns4=(document.layers && !this.dom)?1:0;
            this.bw=(this.ie7 || this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
            return this
        }
        var bw=new pro_bwcheck()
        numImages=12                       //默认10个图片
        loaderWidth=350                    //设置进度条的宽度
        currentImg=0
        function pro_doc_size(){           //判断显示区域
            this.x=0;this.x2=bw.ie && document.body.offsetWidth-20||innerWidth||0;
            this.y=0;this.y2=bw.ie && document.body.offsetHeight-5||innerHeight||0;
            if(!this.x2||!this.y2) return message('窗体的宽度和高度不够！')
            this.x50=this.x2/2;this.y50=this.y2/2;
            return this;
        }
        function pro_obj(obj,nest){            //定义页面中承载进度条的控件属性
            nest=(!nest) ? "":'document.'+nest+'.'
            this.evnt=bw.dom? document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+"document.layers." +obj):0;
            this.css=bw.dom||bw.ie4?this.evnt.style:this.evnt;
            this.ref=this.css
            this.w=this.evnt.offsetWidth||this.css.clip.width||
                this.ref.width||this.css.pixelWidth||0;
            return this
        }
        pro_obj.prototype.moveIt = function(x,y){              //定义移动方法
            this.x=x;this.y=y; this.css.left=x;this.css.top=y
        }
        pro_obj.prototype.clipTo = function(t,r,b,l,setwidth){ //重新定义裁剪方法
            this.ct=t; this.cr=r; this.cb=b; this.cl=l
            if(bw.ns4){
                this.css.clip.top=t;this.css.clip.right=r
                this.css.clip.bottom=b;this.css.clip.left=l
            }else{
                if(t<0)t=0;if(r<0)r=0;if(b<0)b=0;if(b<0)b=0
                this.css.clip="rect("+t+","+r+","+b+","+l+")";
                if(setwidth){this.css.pixelWidth=this.css.width=r;
                    this.css.pixelHeight=this.css.height=b}
            }
        }
        var oLoad2
        function startLoading(){
            page=new pro_doc_size()
            //以下设置加载控件的一些基本属性
            oLoadCont=new pro_obj('divLoadCont')
            oLoad=new pro_obj('divLoad1','divLoadCont')
            oLoad2=new pro_obj('divLoad2','divLoadCont.document.divLoad1')
            oLoadText=new pro_obj('divLoadText','divLoadCont.document.divLoad1')
            oLoad.moveIt(page.x50-loaderWidth/2,page.y50-20)
            oLoadText.moveIt(loaderWidth/2 - oLoadText.w/2,10)
            oLoad.clipTo(0,loaderWidth,40,0,1)   //裁剪区域
            oLoad2.per = loaderWidth/numImages   //百分比
        }
        function loadIt_display(ok){
            currentImg++
            if(oLoad2) oLoad2.clipTo(0,oLoad2.per*currentImg,40,0,1)       //裁剪显示的区域
            if(currentImg<=numImages) setTimeout("loadIt_display(1)",200)  //使用定时器不断加载图片
            else{
                oLoadCont.css.visibility='hidden'                            //进度条加载完成后隐藏
            }
        }
    </script>
</head>
<body>
<div id="divLoadCont">
    <div id="divLoad1">
        <div id="divLoad2"></div><br>
        <div id="divLoadText">
            页面加载中，请稍等...
        </div>
    </div>
</div>
<script>
    startLoading();
    loadIt_display(1);
</script>
</body>
</html>